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In this photo of the underside of the 721TS chassis (to the right of the chassis) is the electromagnetic ion trap. It's also possible to see the leads for the speaker's field coil if you look closely. I've noted 3 different types of ion traps which were used on many 1946-1948 sets. The first is the double-field electromagnetic type used in the 621TS, 630TS, 721TS and the 1948 8TS30's which is secured by two thumbscrews which are located on top. The other two that I've seen are PM types, one being the ring type which is on the 1948-1/2 8TS30 and my Crosley 9-408 and the other is a clamp type secured by two wing-nuts and often has pieces of blue tubing on the front pole piece and black tubing on the rear.
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07-04-2002, 09:45 AM
Threaded Mode